Rotary pump



H. L. SWAN ROTARY PUMP April 9, 1935-.

Filed Deo. 5, 1933 2 Sheets-Sheet 1 Enuznrur Sltturntgs.

April 9, 1935. H. L. SWAN 1,997,350

' ROTARY PUMP Filed Dec. 5, 1935 2 sheets-sheet 2 lllll latente'd Apr. $81935 y v I 3 t o 't t 1,997,350 y i. ROTARY PUMP Y `Harry L. Swan, Hot Springs, Arln` Applicationnember s, 1933, serial No. 701,033 Y comms. (cima-13s) o f on This invention relates to rotary pumps or corn-V Figure l is a central horizontal section through pressors and while it is used efciently for the the structure, a portion of one'of the piston heads purpose of `forcingiiuids, it is-to be understood being shown partly in planand partly in section, that Withnecessary Inodcations it can also be Y Figure 2 is a reduced section on line 2`-2,.` utilized as an efficient rotary enginev of t either the Figure l. V Y

steamer internalcombustion type. Figure 3 is a vertical longitudinal vsection on Heretofore, in the'constructionofV rotary pumps a reducedl scale, "one of the :piston heads being or the like it has been practically impossible to` shown partly inelevation and partly in section. provide a perfect contact at all times between the Referring to the iigures by characters of ref- Al() stator andthe rotor and 'this has beena very unerence `Si designates astator which is formed of 10v desirable fault because of the leakage and re-` two opposed similar sections land 2; the-edge of sultantloss` of power which has occurred. p each sectionbeing providedwith an Outstanding Y Itis an object of the present invention to pro-` iiange 3 whereby the sections can be held together vide the structure with a statorand a rotor so` by bolts 4 or the like extendingthrough the lliA shaped as to permit `the use of metal packing for `flanges. Each section I and 2 constitutes-a section 15 maintaining tight connections between the `piston of a sphere, said section being slightly less than heads and the Statolg l :j 1V Y a hemisphere so that when the sections are as- It is a` further object `to soshape` the stator and sembled aslshown for example'in Figure 2,v they` the rotor that the curvatures of the cooperating will cooperate to form a cavity 5v therebetween 2o faces will remain constant and thereby eliminate which is ellipsoidal in contour with its horizontal 20L any necessity` of utilizing packing Which must diameters equal, as will be apparent by referring flexlduring the operation of the device in order to' Figure Y1v While the remaining diameters gradto compensate for variations incurvatures. l ually shorten until they reach the verticalaxis of t l :It isa well knownfact that no method'of pack, Y thestator. j i i1 r A ing metal to metalsurfaces is equal to that` of y The `two sections of the statorha've oppositely '25,

the metal ring such-as used upon enginewpistons extending bearing portions 6 which cooperate to and the like. An object ofthe present invention house bushings'in which'are `ournalled the-oppo is to provide a structure so shaped asnto'permit sitely extending Shafts 'l and" 8 Of `a rotor 9;` the use of packing substantially the saine as that Shaft 8 Can'be aStllb Shaft Seated ina bearing @up Y commonly employed,` y, t l Illforrning` one of the bushings and secured in 30 A still furtherobject is to provide a double actany manner desired Within One 0f the bearings "3 ing mechanismwhereby during the operation of 6 :so 'as to provide a Sealed Cenneeton. Shaft 'l theV structure as 5a, pump Vit'willdeliver .an un# can be journalled in a sleeve Il constituting the Y broken,A non-fluctuatingstream.` i other bushing and suitably packed as shown at `Another object is to provide astructure which, I2 t0 PleVentleakage. f i Y I Y H 35 if used asa steam or -other -fluid engineywill op- The rotor 9 -is ellipsoidal, its aXis of rotation t erateunder a, Constant and unvarying `torqle,,the heilig COaXial With the lOIlg dialneterof the iOtOI; equivalent of one complete pistonhead being un'- and its curvaturefrom shaft to shaft correspondi der constant pressure. f Y ing with theucurvaturesof those'portions of'the 40 n Astill further object is to provide a structure of inner surface of thexstator lying in lacentral ver-i 4o this character which, if usedj as an-internal'comticalV 'plane- "FufthelmOle thel short diameter of `bustion engine, can produce three or more im- -the rotor is Vsubstantially'equal to the shortdiam` pulses per revolution ofthe rotor. t Veter of the stator andV asiaresult of these propor i l i `With the foregoing and other objects inview tions the rotor 9 constantly maintains a Working which'will appear as the description'proceeds,tthe Contact With the StatOI at the peints 12 OCCUDY- 4.5K. 4 t invention consists of certainnovel details of'iconinga plane perpendicular to the meeting faces struction and combinations of parts hereinafter of the stator sections Vand extending akiallyof nlorefully` describedV and pointed outwinthe the rotor'.` j' 'i i claims, it bein'gunderstood that: changes may be As the rotor is circular in transverse section' made in the construction and arrangementcof Vand ellipticalv in longitudinalsection and as the 50l parts without departing from the spirit of the stator is circular, in horizontal section but elinventionas claimed. t i vliptical infvertical-section, it Will be obvious that Infitheaccompanying drawings the preferred concave-convex chambers willbe left between the form of the invention has been shown. f rotor and stator, these chambers being, oppositely 515; y .Insaid drawings:` Y l disposed asindicated at |3and Mandbeing grad-` ually reduced in area toward the points of contact I2; Each space is provided with an intake l5 Vand an outlet I6 located adjacent to Opposed extremities of the chamber and close to the points of contact between the rotor and the stator. y A

Formed within the rotor are radial slots l1 extending in the direction of the axis of rotation and in each slot is slidably mounted a segmental piston head it. The outer'edge of eachy head is arc'- uate as indicated at VISand is curved to `correspond with the curvature of the interior of each stator section. ljach piston head has a groove 2o in its arcuate edge providing a seat for a .metal cated back of them and, consequently, the pack-V Vtendl from shaft l to' shaft ti.

packing strip 2i, the ends of the strip ber'ig eictended into the rotor toward its axis ogrotationf;

These packing strips are urged outwardly. in any suitable manner, as by means of springs 2l le:

inglstrips are maintainedA in contact with the inner' surface of the stator' so as`4 to' pr'diic' a tight working nt. l l

Springs 23 are preferablyseated in registering bores in the rotoran'd in' the inner edge`r portions of the piston heads and thesevspring's can" beheld against buckling byv mounting them on pins Z5' extending longitudinally of the bores.

For the purpose or maintaining tight connections between the'rotor and stator atV andadjacent tothe points of contact i2, grooves are formed inthe rotor between the slots I'iand ex- Each of these grooves is provided lwith a metal packing' 'strip 2'! similar to strips 2i, said strip being packed by a spring 28 so as to be edged outwardly Va limited distance.4

Assuming that the structure' herein described i is to be used for forcing fiuid, it will be apparent that fluid will be admitted to each chamber i3 or M through; an' intake l5. As' a piston` head i@ advances past the points of contact l2 and toward the intake i-51 it will force in advance of it all rluid'- inlthe pathV thereof within compartment M Y l and at `the same time draw :the fluid' into the space back of the piston1 head duringy the contin-V uedadvance oi said head. vThe'rluidb'eing vforced Yforwardly by'headl 8 will be expelled through the outlet I6 of the compartment iii and'during this opera-tiona similar action is taking placeVV inthe compartment 13'.'V However by providing three piston h'ead's' as-shownth'eexpelling actions from theA two compartmentswill'lap' so thatl the resultant delivery'` or-rluidwill be" continuous. As the strips 2l and' 2? are of .substantially they same curvature as the inner surfaces of sections l and 2'; as will be apparent by referring to Figures land 3, itwill be obvious that the sealing action oftherstrips will' be equal to that produced b'y a ring on a4 pump* piston and .it becomes un'necesrl sary toprovide'sealsadapted to flex inorder toV compensate for wide variations in curvatures.

Onthecontrary rthe wearing action upon" alllpore Y By utilizing an ellipsoidal rotor within an ellipsoidal stator all disadvantages heretofore incident to the proper sealing of a rotary pump or engine are eliminated, and it becomes possible to produce a structure of this character which is light, durable and compact in proportion to the power de- Veloped.

What is claimed is:

1. A stator comprising opposed sections each consisting o f a sector of af sphere whichis less than a hemisphere, said sections being joined to provide an ellipsoidal cavity, an ellipsoidal rotor the stator having its axis of rotation coincident with its long diameter and at right angles to the short diameter of the cavity, said rotor contacting constantly with the` stator at xed diametrically opposed points to divide the cavity into noncornnunicating concavo-convex chambers, and c lpiston heads carried by the rotor and slidable in v planes extending longitudinally of its axis of ro- 2.'A stator comprising opposed sections Veach consisting of a V'sector of a4 sphere which i's less than ai. hemispheresaid sections being joined' to Y provide an llip'soi'dal cavity, anellipsojidal" rotor in the statorlhavi'ng its axiso'f' rotationV coincident with its' long diameter and at Vright angles to the short dia-meteror the" cavity', said rotor contact-A ing constantly with the stator at xed diametri-'J callyl opposed points to' divide the cavity intoflnoncommunicating Yic'oncavo-convex cl'iarno'ers,` and piston heads-:carried hy the' rotor and slidalole in Y planes extending longitudinally of its axis orotation, the diameter of the' rotor ina-ny'plane` per; pendicul'ar toits axis of rotation being substanl tially equal to' thatsl'iort diameter or thecavity in the same plane therewith. f

3. A stato V` ccmprising'opposed sections` eachy consistingof a sector of a sphere which is less than a hemisphere, said sections being joined to providean'v ellipsoidal cavity, anV ellipsoi-dal' rotor in the stator having its axisoi rotation coincident with its longdi'amete-r and'fa't righty ang-les tothe short diameter ofthe cavity, sai'drotor contacting-constantly y with thestaftor atfixed diametri# cally opposed' points tof divide thecavity into'non? communicating? concave-convex Vchambers;V and piston' heads carried by therotor and"'slidablei in planes extending longitudinally of its'axis' of ro` tation, the diameter of therot-orirr any plane perpendicular toits'axis of rotationebe'ing sbstantially'equal' tothatshort diameter of the cavity in' the' sam'eplane therewith, the? outer edge' ofY each piston head being-parallel'with those faces' of thecavitywithwhich'they cooperate.y l Y fla At stator comprising' opposed' sections each consisting of" als'ector of a sphere which" is less thaniahemisphere, said sectionsbeing joined to provide an ellipsoidal cavity, ellipsoi'dalf rotor in the statorhavin'g its axis of rotation coincident with" its long diameter and3 at right* anglesI to 'the short diameter ofthe cavity, said rotor contacting constantly with the stator atffixeol'y diametrically `opposed points to' divide the" cavity, into noncommunicating concave-convex .chambers-f and piston h'e'ads carried by the rotor and slidable'in planes exte'ndin'g'-y longitudinally ofl itsaxis-fof rotation," the' diameter of: the rotor infany plane vperpendicular to its axis ofI rotation beingsubstan'- tiallyv squali to thatAv short"diameter ofi' 'the cavity in'y the same planetherewith'the outer edge'of Y each piston head being parallel'fwithifthose'ffaces or the' cavity withwhich" theyv cooperate; and a vmetal packingfstripfcarriedfbythe outer Vedge of each piston head for constant,"Vworkingfcontact with th wall of the cavity in a plane extending axially of the rotor.

5. A' stator comprising opposed sections each consisting of a sectorV of asphere which is less than a hemisphere, said sectionsbeing joined to `provide an ellipsoidal cavity, an ellipsoidal rotor in the stator having itsv axis of rotation coincident with its long diameter andat right anglesr to the short diameter of the cavity, said Vrotor contacting constantly with the stator at fixed diametrically opposed points to divide the cavity into non-communicating concave-convex 'cham` bers, and piston heads carried by the rotor and slidable in planes extending longitudinally of its axis of rotation, the diameter of the rotor Vin any plane perpendicular toi itsaxis of rotation being substantially equal to that short diam- `eter of the cavity in the same plane therewith,

the outeredge of each piston `head being parallel `with those faces of the cavityA with which they cooperate, and a metal packingstrip carried by the outer edge of each piston head-forconstant working contact with the Wall of the cavity .in a plane extending axially of the rotor, and metal lic packing strips carried by the rotor between the piston heads for working contact with the stator along opposed arcuate lines in planes extending axially of the rotor, thereby to divide the cavity into separate chambersseparated by the rotor. c 1 A 6. A device of the class described including an ellipsoidal rotor,` a stator housing the rotor` and coinprisingcopposed spherical sections each of which is less than a hemisphere whereby,

,when the sections are assembled, they contact throughout the length of their inner surfaces at xed opposite points With the rotor in a plane extending axially of the rotor. 7. A device of the class described including an ellipsoidal rotor, a stator housing the rotorand comprising opposed spherical sections each of Which is `less than a hemisphere whereby, when the sections are assembled, they contact throughout `the length offtheir inner surfaces at lxed opposite points with the rotor in a plane extending axially ofthe rotor thereby to produce opposed` chambers .between the rotor and stator separated `by said points of contact between the rotor and stator, each chamber being `concave-convex.

v Working contact along xed opposed lines a W plane extending longitudinally of the axis of rotation and perpendicular to the contacting faces of the stator sections, and slidable piston headsv carried `by the rotor and having outer edges the curvatures of which coincide with the curvature of the inner `surface of the stator in any plane radiating from the axis of rotation.

9. A stator having a cavity elliptical in vertical section andcircular in horizontal section, an' ellipsoidal rotor thereinrotatable about its long` axis andhaving a constant working contact with f the wall of the stator at fixed diametrically opi posed points thereby to `divide the cavity into opposed non-communicating concave-convex chambers, yieldingly pressed piston heads slidable 'radially Within the rotor and having their` outer or free edges working close to and parallel at all `timeswith the adjacent wall of the cavity, and packing strips carried `by said edges and having a tight, wiping contact'with the wall of V4o, c bers into non-communicating high and low presi the lcavity thereby to divide each of said chamsure sides. o

' i HARRY L. SWAN.l 

